2.6.25.12, 2.6.26-git11: Is this odd NFS behaviour?

I'm editing a script on a box running 2.6.25.12 and exported on NFS, I'm testing the script on another two boxes, one running 2.6.25.12 and the other 2.6.26-git11.

Sometimes I save the edit file and the test boxes don't see the file change, so I have to save the file again. I'm using vim 7.0 if it matters.

All boxes are connected to localnet and I'm working through PuTTY terminals on a WinXP desktop box. (Three linux boxes headless).

There were times when I saved and quit the edit file, had to reopen it and save-quit again for the test boxes to see the changes.

nfs exports: grant [at] deltre:~$ cat /etc/exports # See exports(5) for a description. # This file contains a list of all directories exported to other computers. # It is used by rpc.nfsd and rpc.mountd.